3" bore 6 caliber mortar, can throw a 15 ounce-size can half full of cement, weighing about 1 lb, 300+ yards on an ounce of Fg black powder.

I only fill the cans half-way because they fly straight that way, like a giant shotgun slug or badminton shuttlecock. You have to load them nose first thought, otherwise the force of the propellant blows the 'skirt' out and ruins accuracy.